pin old kernel for tablets

hosts/default.nix

@@ -1,4 +1,4 @@
-{ inputs }:
+{ inputs, ... }:
 
 let
   nixpkgs      = inputs.nixpkgs;

hosts/hacks/rust-fix.patch

@@ -1,12 +0,0 @@
-diff --recursive -u linux-6.15.9.orig/scripts/generate_rust_target.rs linux-6.15.9/scripts/generate_rust_target.rs
---- linux-6.15.9.orig/scripts/generate_rust_target.rs	2025-08-01 10:51:29.000000000 +0200
-+++ linux-6.15.9/scripts/generate_rust_target.rs	2025-11-29 12:30:54.792372738 +0100
-@@ -225,7 +225,7 @@
-         ts.push("features", features);
-         ts.push("llvm-target", "x86_64-linux-gnu");
-         ts.push("supported-sanitizers", ["kcfi", "kernel-address"]);
--        ts.push("target-pointer-width", "64");
-+        ts.push("target-pointer-width", 64);
-     } else if cfg.has("X86_32") {
-         // This only works on UML, as i386 otherwise needs regparm support in rustc
-         if !cfg.has("UML") {

hosts/nix-surface.nix

@@ -1,4 +1,11 @@
-{ config, lib, modulesPath, ... }:
+{ config, lib, pkgs, inputs, modulesPath, ... }:
+let
+  refSystem = inputs.nixpkgs-old-kernel.lib.nixosSystem {
+    system = pkgs.system;
+    modules = [ inputs.nixos-hardware.nixosModules.microsoft-surface-go ];
+  };
+  refKernelPackages = refSystem.config.boot.kernelPackages;
+in 
 {
   imports =
     [ (modulesPath + "/installer/scan/not-detected.nix")
@@ -16,10 +23,7 @@
     "rd.systemd.show_status=auto"
   ];
 
-  boot.kernelPatches = [{
-    name = "rust-1.91-fix";
-    patch = ./hacks/rust-fix.patch;
-  }];
+  boot.kernelPackages = lib.mkForce refKernelPackages;
 
   disko.devices.disk.main.content.partitions.swap.size = "8G";
   nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";